What will be the Node.js equivalent of this php json_encode ?

Question

I am looking for the Node.js of the following PHP Script:

$SMA_APICall = "https://www.alphavantage.co/query?function=SMA&symbol=".$symbolValue."&interval=15min&time_period=10&series_type=close&apikey=R3MGTYHWHQ2LXMRS";
          $SMAresponse = file_get_contents($SMA_APICall);
          $jsonSMA = json_encode( $SMAresponse);

Here, I am trying to make a call to an API. The API call returns a json object. I want to repeat the same thing using Node js

How do I make call to the API. I used this : var jsonFile = "link to api" . This gives me jsonFile variable holding a string of the link. Instead I want to get the data from the link. — user45437
– user45437, Commented Oct 30, 2017 at 0:37
errr .... you are already getting json from the http call, so no need to encode it (in php above). What you probably want is json_decode (in php) which is typically a JSON.parse in js. Also, dont post publicly your api keys for services you subscribe. — YvesLeBorg
– YvesLeBorg, Commented Oct 30, 2017 at 2:49

Ryan W · Accepted Answer · 2017-10-30 01:17:53Z

1

I believe what you're trying to do is making a request to an API and get the JSON data. Here's how you can do it with native Node.js module https

 const https = require('https');

 https.get(`https://www.alphavantage.co/query?function=SMA&symbol=${symbolValue}&interval=15min&time_period=10&series_type=close&apikey=R3MGTYHWHQ2LXMRS`, (resp) => {
  let data = '';

  resp.on('data', (chunk) => {
    data += chunk;
  });

  resp.on('end', () => {
    console.log(JSON.parse(data)); // JSON Data Here
  });

}).on("error", (err) => {
  console.log("Error: " + err.message);
});

There're several other ways you can do this with other simpler packages. I highly recommend axios because it's cleaner and easier.

The full examples please refer to this article

answered Oct 30, 2017 at 1:17

Ryan W

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Alec Fenichel · Accepted Answer · 2017-10-30 01:16:28Z

0

Take a look at the request library: https://github.com/request/request

var request = require('request');
var url = "https://www.alphavantage.co/query?function=SMA&symbol=" + symbolValue + "&interval=15min&time_period=10&series_type=close&apikey=R3MGTYHWHQ2LXMRS";
request(url, function (error, response, body) {
  if (!error && response.statusCode == 200) {
    var jsonSMA = JSON.parse(body);
    // Continue code here
  }
});

answered Oct 30, 2017 at 1:16

Alec Fenichel

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4 Comments

user45437 Over a year ago

It says cannot find module 'request'. What to do about this?

Alec Fenichel Over a year ago

You need to install this module. Run npm install --save request on your command line. --save will add it as a dependency in your package.json file.

user45437 Over a year ago

So now, all the data I am getting is being stored in jsonSMA. The issue which I am facing right now is , how do I access the data in jsonSMA globally. I have to make such API Calls to many different APIs. So how to i make a global variable jsonSMA. I tried creating var jsonSMA outside of the request call. It doesn't work/

Alec Fenichel Over a year ago

Node.js is asynchronous unlike PHP. This has many advantages for web applications but it takes some getting used to. See docs.nodejitsu.com/articles/getting-started/control-flow/…. If you need to make a number of API requests, I would recommend looking into the async module - github.com/caolan/async.

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